lucene-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-528) Optimization for IndexWriter.addIndexes()
Date Fri, 20 Oct 2006 13:35:38 GMT
    [ http://issues.apache.org/jira/browse/LUCENE-528?page=comments#action_12443841 ] 
            
Yonik Seeley commented on LUCENE-528:
-------------------------------------

I think you need to ensure that no segments from the source index "S" remain after the call,
right?


> Optimization for IndexWriter.addIndexes()
> -----------------------------------------
>
>                 Key: LUCENE-528
>                 URL: http://issues.apache.org/jira/browse/LUCENE-528
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Steven Tamm
>         Assigned To: Otis Gospodnetic
>            Priority: Minor
>         Attachments: AddIndexes.patch
>
>
> One big performance problem with IndexWriter.addIndexes() is that it has to optimize
the index both before and after adding the segments.  When you have a very large index, to
which you are adding batches of small updates, these calls to optimize make using addIndexes()
impossible.  It makes parallel updates very frustrating.
> Here is an optimized function that helps out by calling mergeSegments only on the newly
added documents.  It will try to avoid calling mergeSegments until the end, unless you're
adding a lot of documents at once.
> I also have an extensive unit test that verifies that this function works correctly if
people are interested.  I gave it a different name because it has very different performance
characteristics which can make querying take longer.

-- 
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira

        

---------------------------------------------------------------------
To unsubscribe, e-mail: java-dev-unsubscribe@lucene.apache.org
For additional commands, e-mail: java-dev-help@lucene.apache.org


Mime
View raw message